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Securities - Securities with gross unrealized losses (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | $ 106,408 | $ 31,633
Twelve Months or More | 90,974 | 10,522
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 1,612,546 | 1,316,106
Twelve Months or More | 842,065 | 307,277
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 306,059 | 46,537
Twelve Months or More | 86,863 | 17,261
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 4,705,175 | 2,935,314
Twelve Months or More | 853,053 | 462,192
U.S. Treasuries |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 1,966 |
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 268,581 |
U.S. Government agencies |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 6,624 | 1,745
Twelve Months or More | 5,694 | 882
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 140,646 | 86,168
Twelve Months or More | 44,295 | 24,118
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 8,124 | 529
Twelve Months or More | 2,833 | 1,236
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 157,776 | 73,353
Twelve Months or More | 22,166 | 23,763
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 67,934 | 18,768
Twelve Months or More | 57,103 | 5,510
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 1,058,367 | 868,327
Twelve Months or More | 556,812 | 184,819
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 98,405 | 17,381
Twelve Months or More | 44,374 | 8,604
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 1,607,878 | 1,274,934
Twelve Months or More | 398,080 | 221,435
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 17,920 | 4,937
Twelve Months or More | 7,031 |
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 273,429 | 169,240
Twelve Months or More | 55,589 |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 32,801 | 10,911
Twelve Months or More | 11,729 |
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 562,732 | 432,300
Twelve Months or More | 90,910 |
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 13,930 | 4,902
Twelve Months or More | 14,743 | 3,119
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 140,104 | 154,963
Twelve Months or More | 129,759 | 75,450
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 79,666 | 13,120
Twelve Months or More | 15,809 | 5,310
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 876,459 | 846,581
Twelve Months or More | 171,206 | 98,106
State and municipal obligations |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 71,078 | 1,867
Twelve Months or More | 4,748 | 352
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 960,986 | 123,987
Twelve Months or More | 29,605 | 8,579
Small Business Administration loan-backed securities |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months |  | 1,281
Twelve Months or More | 6,403 | 1,011
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months |  | 37,408
Twelve Months or More | 55,610 | 22,890
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 13,526 | 2,720
Twelve Months or More | 7,370 | 1,759
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 247,135 | 179,168
Twelve Months or More | 141,086 | 110,309
Corporate securities. |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 493 | 9
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | $ 23,628 | $ 4,991

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